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INTERNAL COMBUSTION ENGINE.

APPLICATION FILED JIULYIT, 1914.

1,306,979. Patented June 17, 1919.

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WILLIAM JGSEPH S ILL, OF LONDONpENGLANID.

ITil'TERNAL-COMBUSTION ENGINE.

Application filed July 1? To all whom it may m Jcrn:

Be it known that l, WILLIAM JOSEPH S'i'lLL, a sub ect of the King of Great Britain, and a resident of London, England,

have invented certain new and useful l m provements in Internal-Colnbustion Engines, of which the following is a specification.

-This invention relates to improvements in or relating to internal combustion engines and has reference to engines of those types (generally known as Diesel engines) in which the combustible charge is injected into ainwhich has been previously compressed and the temperature of 'iwhichhas been raised to a point at inhiclijgnitiori will take place.

In Diesel engines as at present constructed the air charge must be compressed to a very high degree in order that a satisfactory ignition temperature may be attained, especially at stating with a cool engine.

n engined constructed in accordance with my prior British Letters Patent No. 25356 of 1910 where steam is "used expansively at the backs of the pistons, it. has been found that the Diesel cycle can be employed with much lower compression pressures after the engine has been started up and run for a short time under steam than is ordinarily necessary and the objectof my present invention is to PIOVldQy ordinary Diesel engines which have no steam sidewith means whereby the cylinders can be preheated to and maintained at a temperature such that the compression pressures can be materially reduced. lVithlhis object in view my invention consists hmadly in providing" the cylinder jackets with waterat or about the temperature at which eva 'iorationtakes place at the boiler pressure employed. Whereby the cylinders are preheated and subsequently. when the engine is running and liring, utilizing the heat of combustion tor evaporating water in thejackets whereby the water then operates as a cooling, agent to maintain the cylinder wall temperature at or about that to which it was. initially preheated. in other words, the pie-heating of cylinders attained by providing tne cylnuler' w'rtl jacketswl ieh form part of a separately tired. steamgeneration systei'n providing.means tor setting pp a circulation of hot water from-the boiler througzsl thesexjacltets. this water being thus maintained-pat.or aiiout the temperature at which evaporation.takes place inlhe boiler.

Specification of Letters Patent.

, 1914. Serial No. 851,584.

By this mean the hot water which initially heats the interior surfaces of the cylinder raises the temperature of the air contained within such surfaces during the early part of the compression stroke, and thereforereduces the heat lost to the walls as compared with that lost in other forms of internal combustion engines.

In the accompanying drawing which is merely a diagram, the internal combustion engine cylinder is designated by the numeral 1 and this cylinder is provided with a jacket 2 which is associated with a boiler 3 by ineans of the pipes 4i.- The boiler is initially fired by a burner or other firing means 5 and subsequently by the burner 6 to which are fed the exhaust gases from the engine. The steam produced-may be led off by a pipe 7 for use as required.

When the engine is running and gaining temperature by the combustion of the charge, the water reverses its function and operates, by evaporation, as a cooling agent, thus maintaining the cylinders at a safe teen utilized either at the backs of the pistons in thd manner indicated in my prior specification above alluded to, or in connection with a separate cylinder or steam turbine. The means for firing the boiler may consist of an oil burner which can, if desirable, be put out when the. ei'igine is running-and there is sul'ticient waste heat from the cylinders "and exhaust gases to generatea useful quantity of steam and maintain the cylinders at the required higher working temperature It will, of course, be appreciated that engines constructed and operated in accordance with the foregoing conditions will not be sul ject to the starting up difficulties from which Diesel engines notoriously suffer, but at the same time l wish it to be understood that my invention is not concerned so much with obviating starting diliiculties but is primarily ameans for enabling theleompression .pre'ssures necessar'y'to be so reduced that a lighter cylinder structure can be "safely employed.

- ,"What I claim and desire to secure by Letters Patent is:v i

A method of working Diesel engines consisting in initially raising the temperature of the water in the cylinder jackets to the temperature of evaporation of an adjacent boiler with which said jackets are in -'con- In testimony whereof I affix my signature in presence of two Witnesses.

WILLIAM JOSEPH STILL.

whereby the compression pressure at which spontaneous combushon occurs wltlun the englne cyhnde'rs 1s conslderably reducedgand subsequently utilizing the heat of combus- Witnesses: 1011 for malntzumng the holler at eva-porat- EDWARD A. C011, 1 H. D. JAMESON.

ing temperature. 

